Fine structure of the impinging turbulent jet

The turbulent structure of axisynimetric submerged impinging jet has been experimentally studied for the conditions of external low-amplitude periodical forcing. The conditional sampling technique is applied along with 2D PIV and electrodiffusion method. The triple decomposition of velocity pulsations is applied in order to distinguish the coherent and stochastic parts of turbulent kinetic energy and statistical characteristics. The major contribution of coherent component in the near field of the jet is ascertained. With the purpose of determining the fine structure of hydrodinamical characteristics the high-resolution PIV experiments (up to 0.17 mm) have been carried out. This approach allowed detecting the travelling waves of pulsating characteristics in the core of impinging jet including close vicinity of stagnation point.